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datareductionwithRST

于 2010-07-01 发布文件大小:16KB

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下载积分: 1 下载次数: 16

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代码说明：

这是基于邻域粒化和粗糙逼近的数值属性约简matlab代码(This is a neighborhood-based grain and rough approximation of the value of attribute reduction matlab code)

文件列表：

data reduction with rough sets
..............................\demo.m,495,2006-11-20
..............................\entropy.m,164,2005-05-08
..............................\entropy_interval.m,682,2006-05-12
..............................\fs_con_N.m,2442,2006-11-20
..............................\fs_entropy.asv,2482,2006-10-13
..............................\fs_entropy.m,2881,2006-10-13
..............................\fs_neighbor.asv,2692,2006-10-13
..............................\fs_neighbor.m,2726,2006-10-13
..............................\kersim.m,230,2006-04-16
..............................\kersim_crisp.m,94,2006-10-13
..............................\wine.mat,9559,2006-04-01

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to understand the Algorithm go to matlab help in page dct2 and idct2 to get the mathematical expression for M = N = 8, we can calculate the most of hard values and save it as LUTs to speed up the execution now compare our special 8X8 functions with the internal general functions use this code: A = int32(100*rand(8,8)) tic for i = 1 : 1000 IDCT_8X8(DCT_8X8(A)) end toc tic for i = 1 : 1000 idct2(dct2(A)) end toc i had built the general functions too, but with low speed (to understand the Algorithm go to matlab help in page dct2 and idct2 to get the mathematical expressionfor M = N = 8, we can calculate the most of hard values and save it as LUTs to speed up the executionnow compare our special 8X8 functions with the internal general functionsuse this code: A = int32 (100* rand (8,8)) tic for i = 1: 1000 IDCT_8X8 (DCT_8X8 (A)) end toc tic for i = 1: 1000 idct2 (dct2 (A)) end toc i had built the general functions too, but with low speed)

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